Modelling the Support Mat in exhaust DPF
 

Hey everyone,
I am trying to analyze the flow distribution over DPF brick but i am not sure about how to model the mat. Should i model it as porous region like the brick or not? I need your help on this.

Anyone can help? This is really important.

You'll likely have to help us first, I don't know what a DPF brick is.

A DPF is diesel particulate filter which is a component used in order to lower the exhaust emission levels. In this component there is a brick which filters the particules in exhaust gas and this brick is rolled with a mat to keep it stable in the canning. I want to model the flow through DPF . The brick is modeled as porous region but i am not sure how to model the mat or should i ignore the mat at all.

i would think it depends how much flow goes through the mat versus just axially down the paths between the mat
if cross flow does happen and you need to model it then you could apply some appropriate porous coeficients in the radial directions

Hi,

As far as I know, the packing material around the DPF brick need not be modelled. Typically there is no flow through that.
However, if you are interested in computing the heat transfer, then the material might become important.